What are the diseases of sunflower? Diseases and control methods of sunflower

Sunflower is an evergreen shrub. Native to Madagascar. After the introduction of our country, it was planted in the south and potted in the greenhouses in the north. Loose-tailed sunflower has the elegance of coconut trees, and the strength of bamboo, the stem is straight, the leaves are quiet, elegant and chic, and it is a beautiful large-scale foliage flower.

a) Disease. Both sunflower and fishtail sunflower are susceptible to root rot, leaf blight, anthracnose, etc. Root rot and leaf blight are more serious.

1.Root rot.

1) Symptom characteristics.

At the beginning of the susceptibility of the plant, it was manifested as few shoots, weak, small leaves and light color, and poor tree strength. In heavy cases, the leaves fall off, showing typical conduction tissue diseases, and finally the whole plant wilts and dies. The initial symptoms are not obvious and are not easy to detect, but they can be confirmed after the plant shows poor growth and the fruiting body grows in the potting soil and stem base.

The bacterium can be saprophytic, but it is mainly parasitic. The hyphae and mycelium overwinter on the diseased tissues of the host. When the conditions are suitable, the mycelium invades from the wounds of rhizomes, large roots, and lateral roots by means of disease and healthy roots, and then spreads to adjacent tissues.

When the drainage of flower fields and potting soil is not smooth, and moisture is retained, the disease is serious.

2) Prevention and control methods.

Sunflower is a shade-tolerant, warm-loving tropical plant, and the maintenance conditions should meet these requirements. In addition, shade should be provided in summer, and the temperature should be above 10 in winter, and more sunlight should be given. Spray thin liquid fertilizer or concentrated fertilizer once a month from spring to late summer. Promotes strong plant growth.

When dividing the plants, separate the plants with sharp scissors, and apply charcoal powder or sulfur powder to disinfect the wound, and then plant them in pots. The potting soil is made of new soil that does not contain diseased residual tissues.

At the beginning of the disease, 50% carbendazim wettable powder 500 times or 20% methyl phosphorus emulsifiable concentrate 1000 times solution.

1) Symptom characteristics.

The lesions are born on the leaf margin or leaf surface, the shape is irregular, **grayish-white, the edges are brown to dark brown, and the disease-healthy junction is obvious. The tiny black dots on the lesions are the conidia of the pathogen. The germs are spread by airflow, water or rainwater.

In summer and autumn rainy days, the disease is more serious. In the north, it mostly occurs in sheds with high humidity and high temperature.

2) Prevention and control methods.

Diseased leaves are found to be cut off in time. At the initial stage of the disease, spray 600 times of 40% chlorothalonil (Dakonin) suspension or 800 times of 50% thiophanate-methyl sulfur suspension and 500 times of 50% 100 sulfur suspension.

Diseases of sunflowers:

Sunflower is an evergreen shrub. Native to Madagascar. After the introduction of our country, it was planted in the south and potted in the greenhouses in the north.

Scattered sunflower branches are luxuriant, evergreen in all seasons, strong resistance to negativity, it is a potted foliage tree species that has been widely cultivated in recent years, it has the elegance of the coconut tree, and the strength of bamboo, the stem is straight, the leaves are quiet, elegant and chic, it is a beautiful large-scale foliage flower. Both sunflower and fishtail sunflower are susceptible to root rot, leaf blight, anthracnose, etc. Root rot and leaf blight are more serious.

Symptoms Leaf blight is a common disease caused by fungal infection, which has a great impact on the growth of sunflower, which can dry up the leaves and cause the death of the whole plant. Leaf blight first infects leaf tips and leaf margins, and the infected places appear brown spots or strip-like plaques in the early stage, and the spots or patches gradually expand and connect with each other in the middle stage, and the leaves appear gray-white and dry in the later stage.

Solution: Strengthen maintenance, ensure good ventilation, and control air humidity.

When the disease occurs, it can be sprayed with 70% methyl tobuzine 800 solution or 75% chlorothalonil 1000 times solution, sprayed once every 7 10 days, and sprayed 3 to 4 times in a row, which can effectively control the disease.

Symptoms Anthracnose occurs in sunflower and spreads from the leaf margins and tips. The leaves appear round or oval-shaped yellow-brown lesions with slightly raised areas and yellowish edges. As the disease worsens, the lesions will turn black in the later stages, and there will be dense small black spots.

Solution Strengthen water and fertilizer management to enhance plant disease resistance.

From the early stage of the disease, it can be sprayed with 800 times of 50% thiophanate-methyl wettable powder and 800 times of 75% chlorothalonil wettable powder.

Symptoms Leaf spot and leaf blight equally damage leaves, but the symptoms are different. At the onset of leaf spot, small yellow-brown spots appear in the initial stage of leaf disease, which gradually expand into streak spots and can merge into irregular necrotic blocks. Leaf tips and leaf margins are the most susceptible, and when the disease is severe, more than half of most leaves are dried up and curled, such as being burned by fire.

The center of the lesion is dark or grayish-white, surrounded by dark lines around the edge, and small oval black spots are scattered in the later part of the lesion.

Solution At the initial stage of the disease, spraying 300 500 times of 50% Kefudan wettable powder, or 400 650 times of 70% mancozeb wettable powder, once a week, several times in a row, can effectively prevent and treat this disease.

<> sunflower is not poisonous, suitable for breeding at home, daily maintenance of sunflower, need to provide it rich in minerals and pollution-free lake water, but also need to be in the environment is too dry, spray water on the leaves of sunflower, and also need to regularly spray fungicides to prevent and control pests and diseases, so that sunflower grows healthily.

1. No poison.

Sunflower is not poisonous, it is a more common foliage plant, has a high ornamental value, can beautify the indoor environment, and can absorb harmful gases in the air, can reduce the content of benzene, trichloroethylene, formaldehyde and other volatile harmful substances in the environment, is beneficial to human health, suitable for indoor breeding of sunflower.

2. Provide moisture.

Daily maintenance of sunflower, need to provide it with sufficient water, can be watered every other week, water can be rich in minerals and pollution-free lake water, can also be placed in the sun for 8 hours before use, to avoid the impact of chlorine in the tap water on the growth of sunflower.

3. Maintain humidity.

Sunflower is suitable for growing in a warm and humid environment, when daily maintenance of sunflower, if the environment is too dry, it will lead to poor plant growth, so that the leaves of sunflower are wilted and yellow, you need to use a sprayer or a kettle to spray water on the leaves of sunflower to reduce the temperature of the environment and maintain the humidity of sunflower.

4. Prevention and control of pests and diseases.

In the middle of summer, when maintaining the sunflower, you need to open the window every morning and evening to make the indoor air circulate and avoid a large number of bacteria in the air, and you also need to spray the fungicide every other month to the sunflower to prevent and control pests and diseases, so as to avoid the sunflower being infected by the disease, so that it can grow healthy and long.

1. This plant is completely non-toxic.

2. Not only is it not toxic, but it can also be used as a medicinal material for many diseases, and the main role of sunflower as a drug is to converge and stop bleeding, and it has a good effect on diseases with symptoms such as coughing up blood and blood in the stool. It can be seen that the claim that the sunflower is poisonous is completely a rumor.

3. The plant is not toxic, so it can be grown indoors. The plant shape is very beautiful, has a strong ornamental value, and indoor planting can make the interior decoration full of mood and fun. In addition to ornamental effects, sunflower can absorb harmful gases in the air such as formaldehyde, benzene and other volatile bridging harmful gases, which has a good purifying effect on the air and is conducive to our health.

Not only that, the water evaporation performance of the sunflower is very strong, so planting the sunflower indoors is like placing a natural humidifier, placing a pot of sunflower in the room can keep the indoor humidity between 40%-60%, and this performance of the sunflower can also increase the indoor temperature in winter, so it is very beneficial to plant the sunflower indoors. On the other hand, it is also easier to grow and survive indoors, and it is a small palm plant with very good shade tolerance and can be planted in a shady indoor environment.